witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd806fa9f5f0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 spec_open+0x431 sys/kern/spec_vnops.c:159 #6 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #7 vn_open+0x495 sys/kern/vfs_vnops.c:174 #8 diskmapioctl+0x18e sys/dev/diskmap.c:91 #9 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #10 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #11 sys_ioctl+0x5b8 #12 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #12 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #13 Xsyscall+0x128 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *433570 5856 0 0x1000 0x4080000 1 syz-executor.0 334151 35724 0 0x100003 0x80 0 getty db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 witness_warn(2,0,ffffffff81fbde30) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff81fbde30) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020b5f3d8) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800021df3b40) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800021df3b40) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,13,ffffffffffffff1b,0,3,cfdbd7b7010) at Xsyscall+0x128 end of kernel end trace frame: 0xcffc7600a40, count: 9 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic witness_warn ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 witness_warn(2,0,ffffffff81fbde30) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff81fbde30) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020b5f3d8) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800021df3b40) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800021df3b40) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,13,ffffffffffffff1b,0,3,cfdbd7b7010) at Xsyscall+0x128 end of kernel end trace frame: 0xcffc7600a40, count: -6 ddb{1}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021df3880 rbx 0xffff800021df3930 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800021e04000 rax 0xffff8000009d8580 r8 0xffffffff81c91603 kprintf+0x173 r9 0x1 r10 0x25 r11 0x9511becd765298df r12 0x3000000008 r13 0xffff800021df3890 r14 0x100 r15 0x1 rip 0xffffffff81166418 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021df3870 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=433570 stat=onproc flags process=1000 proc=4080000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b5e018,0xffff800020b5e518 process=0xffff800020b2b190 user=0xffff800021dee000, vmspace=0xfffffd807effe2e0 estcpu=36, cpticks=6, pctcpu=0.0 user=0, sys=6, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 5856 57378 58153 0 3 0x3000 suspend syz-executor.0 * 5856 433570 58153 0 7 0x4081000 syz-executor.0 64602 279946 88783 0 3 0x80 nanosleep syz-executor.1 64602 480024 88783 0 3 0x4000080 ttyout syz-executor.1 64602 268422 88783 0 3 0x4000080 kqread syz-executor.1 88783 502650 24422 0 3 0x82 nanosleep syz-executor.1 35724 334151 1 0 7 0x100083 getty 58153 221775 24422 0 3 0x82 nanosleep syz-executor.0 67537 83085 0 0 3 0x14200 acct acct 87593 410933 0 0 3 0x14200 bored sosplice 24422 46213 53806 0 3 0x82 thrsleep syz-fuzzer 24422 137097 53806 0 3 0x4000082 thrsleep syz-fuzzer 24422 186928 53806 0 3 0x4000082 thrsleep syz-fuzzer 24422 243355 53806 0 3 0x4000082 thrsleep syz-fuzzer 24422 167982 53806 0 3 0x4000082 thrsleep syz-fuzzer 24422 507935 53806 0 3 0x4000082 kqread syz-fuzzer 24422 124349 53806 0 3 0x4000082 thrsleep syz-fuzzer 24422 81377 53806 0 3 0x4000082 thrsleep syz-fuzzer 24422 451029 53806 0 3 0x4000082 thrsleep syz-fuzzer 24422 117029 53806 0 3 0x4000082 thrsleep syz-fuzzer 53806 471959 53217 0 3 0x10008a pause ksh 53217 385798 25317 0 3 0x92 select sshd 25317 124469 1 0 3 0x80 select sshd 40744 352823 19533 74 3 0x100092 bpf pflogd 19533 128816 1 0 3 0x80 netio pflogd 82670 88548 5900 73 3 0x100010 ffs_fsync syslogd 5900 466221 1 0 3 0x100082 netio syslogd 4823 12092 1 77 3 0x100090 poll dhclient 26005 82747 1 0 3 0x80 poll dhclient 41716 260940 0 0 3 0x14200 pgzero zerothread 70084 265642 0 0 3 0x14200 aiodoned aiodoned 70627 457617 0 0 3 0x14200 syncer update 40805 241793 0 0 3 0x14200 cleaner cleaner 37098 90929 0 0 3 0x14200 reaper reaper 67087 198646 0 0 3 0x14200 pgdaemon pagedaemon 95838 418157 0 0 3 0x14200 bored crynlk 60693 134954 0 0 3 0x14200 bored crypto 43223 137973 0 0 3 0x40014200 acpi0 acpi0 52412 247305 0 0 3 0x40014200 idle1 39175 76454 0 0 3 0x14200 bored softnet 3921 96746 0 0 3 0x14200 bored systqmp 92417 399682 0 0 3 0x14200 bored systq 31129 406228 0 0 3 0x40014200 bored softclock 19481 173493 0 0 3 0x40014200 idle0 62984 362635 0 0 3 0x14200 bored smr 1 314927 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 5856 (syz-executor.0) thread 0xffff800020b5f3d8 (433570) exclusive rrwlock inode r = 0 (0xfffffd806fa9f5f0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 spec_open+0x431 sys/kern/spec_vnops.c:159 #6 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #7 vn_open+0x495 sys/kern/vfs_vnops.c:174 #8 diskmapioctl+0x18e sys/dev/diskmap.c:91 #9 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #10 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #11 sys_ioctl+0x5b8 #12 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #12 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #13 Xsyscall+0x128 Process 82670 (syslogd) thread 0xffff800020b60500 (88548) exclusive rrwlock inode r = 0 (0xfffffd806ec1cc48) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 sys_fsync+0x114 sys/kern/vfs_syscalls.c:2806 #6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #6 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9579 6452K 7219K 78643K 16942 0 0 pcb 13 8K 8K 78643K 211 0 0 rtable 86 3K 4K 78643K 837 0 0 ifaddr 74 15K 17K 78643K 304 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1626 0 0 iov 0 0K 16K 78643K 324 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1212 76K 77K 78643K 3355 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 35 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 332 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 2618 0 0 sigio 0 0K 0K 78643K 32 0 0 proc 53 50K 83K 78643K 955 0 0 subproc 32 2K 2K 78643K 138 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 258 0 0 in_multi 22 1K 2K 78643K 172 0 0 ether_multi 1 0K 0K 78643K 13 0 0 mrt 0 0K 0K 78643K 9 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 78 344K 344K 78643K 78 0 0 exec 0 0K 1K 78643K 498 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 107 21K 30K 78643K 9577 0 0 UVM aobj 108 4K 4K 78643K 120 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 132 0 0 NDP 18 0K 0K 78643K 89 0 0 temp 214 2752K 2875K 78643K 40022 0 0 kqueue 0 0K 0K 78643K 14 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 19 0 15 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 111 0 109 1 0 1 1 0 8 0 rtentry 112 117 0 84 2 0 2 2 0 8 0 unpcb 120 800 0 790 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 5927 0 5927 1 1 0 1 0 8 0 tcpcb 544 398 0 394 1 0 1 1 0 8 0 inpcb 280 1274 0 1267 2 1 1 2 0 8 0 rttmr 72 1 0 1 1 1 0 1 0 8 0 nd6 48 24 0 21 1 0 1 1 0 8 0 pkpcb 40 14 0 14 6 6 0 1 0 8 0 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1128 39 0 39 12 11 1 1 0 8 1 pffrag 232 5 0 5 3 3 0 1 0 482 0 pffrnode 88 5 0 5 3 3 0 1 0 8 0 pffrent 40 13 0 13 3 3 0 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 76 0 59 1 0 1 1 0 8 0 pfstkey 112 76 0 59 1 0 1 1 0 8 0 pfstate 328 76 0 58 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 471 0 324 13 0 13 13 0 8 1 art_table 32 472 0 324 2 0 2 2 0 8 0 art_node 16 112 0 82 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 6 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 328 0 318 1 0 1 1 0 8 0 shmpl 112 118 0 12 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5337 0 3918 47 0 47 47 0 8 0 ffsino 272 5337 0 3918 96 0 96 96 0 8 0 nchpl 144 9288 0 7658 62 0 62 62 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 200 5926 0 0 312 0 312 312 0 8 0 namei 1024 31102 0 31102 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 6 0 6 3 3 0 1 0 8 0 scxspl 192 28869 0 28868 19 18 1 5 0 8 0 plimitpl 152 256 0 248 1 0 1 1 0 8 0 sigapl 432 2802 0 2786 3 1 2 3 0 8 0 futexpl 56 31952 0 31952 1 0 1 1 0 8 1 knotepl 112 605 0 586 1 0 1 1 0 8 0 kqueuepl 104 578 0 575 1 0 1 1 0 8 0 pipepl 112 1768 0 1749 2 1 1 2 0 8 0 fdescpl 488 2803 0 2786 3 0 3 3 0 8 0 filepl 152 16991 0 16883 7 2 5 6 0 8 0 lockfpl 104 982 0 982 2 1 1 1 0 8 1 lockfspl 48 337 0 337 2 1 1 1 0 8 1 sessionpl 112 26 0 15 1 0 1 1 0 8 0 pgrppl 48 61 0 50 1 0 1 1 0 8 0 ucredpl 96 3571 0 3562 1 0 1 1 0 8 0 zombiepl 144 2787 0 2786 2 1 1 1 0 8 0 processpl 896 2820 0 2786 4 0 4 4 0 8 0 procpl 632 8452 0 8406 5 0 5 5 0 8 1 srpgc 64 15 0 15 8 7 1 1 0 8 1 sosppl 128 49 0 49 9 9 0 1 0 8 0 sockpl 384 2220 0 2201 5 2 3 4 0 8 1 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 24 0 0 2 0 2 2 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 12 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 147 0 0 17 0 17 17 0 8 1 mtagpl 80 12 0 0 1 0 1 1 0 8 0 mbufpl 256 567 0 0 30 1 29 29 0 8 0 bufpl 256 13248 0 6219 440 0 440 440 0 8 0 anonpl 16 264501 0 253804 108 51 57 66 0 125 2 amapchunkpl 152 16924 0 16808 29 21 8 10 0 158 2 amappl16 192 13606 0 12913 97 54 43 46 0 8 8 amappl15 184 212 0 212 2 2 0 1 0 8 0 amappl14 176 381 0 376 1 0 1 1 0 8 0 amappl13 168 515 0 514 2 1 1 1 0 8 0 amappl12 160 320 0 319 2 1 1 1 0 8 0 amappl11 152 363 0 348 1 0 1 1 0 8 0 amappl10 144 91 0 85 1 0 1 1 0 8 0 amappl9 136 1734 0 1729 1 0 1 1 0 8 0 amappl8 128 1271 0 1248 1 0 1 1 0 8 0 amappl7 120 64 0 55 1 0 1 1 0 8 0 amappl6 112 359 0 351 1 0 1 1 0 8 0 amappl5 104 497 0 483 1 0 1 1 0 8 0 amappl4 96 2572 0 2542 2 1 1 2 0 8 0 amappl3 88 1099 0 1088 1 0 1 1 0 8 0 amappl2 80 21852 0 21771 3 1 2 3 0 8 0 amappl1 72 70346 0 69887 26 16 10 20 0 8 0 amappl 80 8814 0 8772 1 0 1 1 0 84 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 119 0 12 2 0 2 2 0 8 0 uaddrrnd 24 2803 0 2786 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2803 0 2786 1 0 1 1 0 8 0 vmmpekpl 168 26249 0 26215 2 0 2 2 0 8 0 vmmpepl 168 346396 0 344463 200 103 97 104 0 357 12 vmsppl 368 2802 0 2786 2 0 2 2 0 8 0 pdppl 4096 5614 0 5572 6 0 6 6 0 8 0 pvpl 32 731778 0 717765 239 96 143 161 0 265 13 pmappl 232 2802 0 2786 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 624 0 5 18 0 18 18 0 8 0